D2D网络中基于组合拍卖的无线资源分配机制

Radio resource allocation mechanism based on combination auction in D2D networks

针对端到端(device-to-device,D2D)用户与蜂窝用户共享频谱资源产生的干扰问题,以最大化系统中D2D链路的吞吐量为优化目标,提出一种联合功率控制和信道分配的资源分配机制。根据D2D用户的干扰门限和蜂窝用户的信干噪比(signal to interference plus noise ratio,SINR)提出了一种基于用户间距离的复用准则,确定D2D用户可复用的信道资源集合;在给定D2D用户复用任意资源集合的前提下,调整D2D用户的发射功率,以衡量各个D2D用户在不同信道资源集合上的吞吐量,但暂不分配功率;基于功率控制的结果,采用组合拍卖的方法为D2D链路分配信道及对应的发射功率,从而实现了联合功率控制和信道分配。因此,系统资源分配结果更为合理。仿真结果表明,该机制能有效抑制跨层干扰和同层干扰,提升D2D链路的吞吐量,提高用户的服务质量(quality of service,QoS)。

Aiming at the interference problem of device-to-device(D2D)users and cellular shared spectrum resources,aiming at optimizing the throughput of D2D links in the system as the optimization goal,a resource allocation mechanism for joint power control and channel allocation is proposed.Firstly,according to the interference threshold of D2D users and the signal to interference plus noise ratio(SINR)of cellular users,a multiplexing criterion based on the distance between users is proposed to determine the set of channel resources that can be reused by D2D users.Secondly,under the premise that a given D2D user multiplexes any set of resources,the D2D user’s transmit power is adjusted to measure the throughput of each D2D user on different channel resource sets,but power is not allocated temporarily.Finally,based on the result of power control,the combination is adopted.The auction method allocates channels and corresponding transmit power for the D2D link,thereby implementing joint power control and channel allocation,so the system resource allocation result is more reasonable.The simulation results show that this mechanism can effectively suppress the cross-layer interference and the same-layer interference,improve the throughput of D2D links,and enhance the user’s QoS.